PTFE is very expensive in comparison with other engineering plastic and the washers work fine in other plastics.
Chopping boards are usually HDPE and are often a cheap source compared with buying from an engineering stockist. It can be machined easily with sharp HSS tools.
Gerry
Leeds UK
________________________________
> To: GrizHFMinimill@yahoogroups.com
> From: chunk07@comcast.net
> Date: Mon, 5 Sep 2011 11:42:37 +0000
> Subject: [GrizHFMinimill] Re: Y Axis Thrust Washers and Locknut
>
>
>
>
> --- In
> GrizHFMinimill@yahoogroups.com<mailto:GrizHFMinimill%40yahoogroups.com>,
> "Mike W" <winklmj@...> wrote:
> >
> > I know this is an old post but Holy Cow...the thrust washers made a
> huge difference in my y-axis! I had a small bit of unknown plastic rod
> (I suspect it to be HDPE) so I made up a few washers. Thanks for
> sharing that.
> >
> > --- In
> GrizHFMinimill@yahoogroups.com<mailto:GrizHFMinimill%40yahoogroups.com>,
> "a3sigma" <dcclark111@> wrote:
> > >
> > > Good morning group,
> > >
> > > I've posted a pdf on the subject.
> > >
> > > http://groups.yahoo.com/group/GrizHFMinimill/files/D.C.%20Clark%20stuff/
> > >
> > > These mods seem to me to make a significant difference. The Y axis
> now feels smooth and consistent throughout it's range, and backlash an
> acceptable 0.005 inches. There's no endplay that I can detect.
> > >
> > > The thrust washers were made of PTFE Delrin from McMaster.com part
> number 8579K28. I also coated them with PTFE grease.
> > >
>
> What is a good source of PTFE? Isn't that the same material as the hard
> plastic cutting boards? As my X2 is down at the moment for controller
> repairs, this would be a good quick project on the lathe.
>
> Chuck in E. TN
>
>
>
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